Image Converter
Batch convert JPG, PNG and WebP images.
Open toolLoading page…
Create compact JPGs with a selectable background.
Your file stays in this browser.
PNG · maximum 25 MB per file
Focus this area, then paste with Ctrl/⌘+VCreate a compact JPG from a PNG and choose the color used behind transparent areas.
JPG is often much smaller for photographs but does not support transparency. MyFileNest fills transparent PNG areas with your chosen color instead of silently turning them black.
PNG to JPG is usually about size or compatibility: a form that only takes JPG, or a photographic PNG that is ten times larger than it needs to be. The one decision that matters is what happens to transparent areas, because JPG cannot store them. MyFileNest lets you choose that colour yourself.
Each PNG is drawn onto a canvas filled with the background colour you choose, then saved as a JPG at the quality you set. Fully transparent pixels become the background colour, and semi-transparent edges, such as the soft outline of a logo, blend into it. Dimensions stay the same unless you enter new ones.
JPG uses lossy compression, which is very efficient for photographs but can add faint halos around sharp text and lines. That is why the right format depends on what the image contains.
| Image content | Convert to JPG? | Reason |
|---|---|---|
| Photograph saved as PNG | Yes | Often several times smaller with no visible loss |
| Screenshot of a document or code | Usually not | JPG softens small text; keep PNG or use WebP |
| Logo with a transparent background | Only for a specific background | Transparency is replaced by a solid colour |
| Diagram with flat colours | Usually not | PNG stays sharper and is often small already |
| Form upload that requires JPG | Yes | Compatibility outweighs the small loss |
A blogger exports a 2,400 × 1,600 holiday photo from an editor as PNG and gets a file of roughly 7 MB. Converting it to JPG at 85% quality produces a file around a tenth of the size that looks identical on screen, because photographs are exactly what JPG compression was designed for.
The same blogger's logo PNG has a transparent background. Converted with a white background, it looks right on a white page but shows a white rectangle on the dark footer. The fix is either to keep the PNG for the footer or to convert a second copy using the footer's colour as the background.
WebP keeps transparency and is usually smaller than both PNG and JPG, which makes it a strong choice for websites. Use PNG to WebP when the destination supports it. If you need a smaller PNG rather than a different format, reduce its dimensions with Image Resizer. And keep your original PNG as the master copy, since every JPG save discards a little detail.
Photographs saved as PNG convert extremely well at 80–85%, which is where most of the file size saving happens. Images that mix photos with text, such as a social media graphic with a headline, need 90% or more to keep letters crisp. If you find yourself pushing quality to 95% or higher to avoid visible artefacts, the image is probably better served by staying PNG or moving to WebP.
Remember that each conversion is a fresh decision. Always convert from the original PNG rather than re-saving an existing JPG at a different quality, which stacks compression losses.
Can I convert many PNGs at once? Yes. Choose several files and they are converted with the same background colour, quality and size settings.
Will the dimensions change? Not unless you enter new values. Empty width and height fields keep the original pixel size.
Is a JPG always smaller than the PNG? For photographs, almost always and often dramatically. For simple flat-colour graphics, the PNG may already be smaller, in which case keep it.
Can I go back to PNG later? You can convert the JPG to PNG, but the details discarded by JPG compression will not return, and transparency will not come back. That is why keeping the original PNG as a master copy matters.
Are files uploaded? No. Conversion runs in your browser tab.
An opaque JPG image with transparent source pixels composited onto your chosen background. Unchanged dimension fields retain the original width and height.
The downloadable 960 × 640 PNG sample has an 80-pixel transparent border. With a white background and unchanged dimensions, that border becomes opaque white while the circle and detail bars remain visible.
PNG is best for transparency, screenshots and sharp graphics. JPG is usually smaller for photographs and opens almost everywhere.
Keep a PNG master when transparency or repeated editing matters, then make a JPG copy for delivery when smaller size is the priority.
JPG has no alpha channel. The rectangle is the background color selected during conversion. Keep the source PNG if the final design needs transparency, or choose a background matching the destination before creating a new JPG.
The file is processed on this device and is not uploaded to MyFileNest. Closing or refreshing the page clears the active session.
Practical limit: Files up to 25 MB are accepted for guests. Very large dimensions, complex documents or limited device memory can affect browser processing.